A storm of lightning and thunder usually with rain and gusty winds--produced by cumulonimbus clouds

A natural occurrence caused by extreme weather or geologic events

a localized, violently destructive windstorm occurring over land....characterized by a long, funnel shaped cloud

A device that measures the size (magnitude) of earthquakes

A giant wave caused by movement of the ocean floor

A depression produced in a region where soluble rock has been removed by groundwater

The ejection of molten rock, steam from a volcano--usually suddenly and violently

a large, destructive fire that spreads quickly over woodland or brush

Watery clay and soil slides down a mountain

An opening in the surface of the earth through which lava, gases, and ash are forced out

A period of dry weather, especially a long one that is dangerous to crops

A large, powerful windstorm that forms over warm ocean waters

A great flowing or overflowing of water, especially over land not usually submerged

A series of vibrations in the earth's crust which may cause the tectonic plates to transform (slide), converge (come together) or diverge (pull away) from each other

a slide of large masses of snow and ice and mud down a mountain

A large-scale disaster, misfortune, or failure

Blinding snowstorms with very strong, cold, wind